Influence of an alternating 3 Hz magnetic field with an induction of 0.1 millitesla on chosen parameters of the human occipital EEG

Heusser, Karsten; Tellschaft, D.; Thoss, F.

doi:10.1016/s0304-3940(97)00881-1

Cited by 31 publications

(17 citation statements)

References 7 publications

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“…Marino et al [1996] found increases in spectral power mainly at higher EEG frequencies (>10 Hz) in the central, parietal and occipital regions at two different ®eld conditions (10 and 1.5 Hz both at 80 mT rms ). Heusser et al [1997] also found increases in occipital EEG spectral power in the beta (12.5± 25.0 Hz) and theta band (3.5±7.5 Hz) after exposure to a 3 Hz (0.1 mT pk ) MF.…”

Section: Magnetic Field Effects Upon Human Electrophysiologymentioning

confidence: 64%

Human electrophysiological and cognitive effects of exposure to ELF magnetic and ELF modulated RF and microwave fields: A review of recent studies

Cook

Thomas

Prato

2002

Bioelectromagnetics

112

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The investigation of weak (<500 microT), extremely low frequency (ELF, 0-300 Hz) magnetic field (MF) exposure upon human cognition and electrophysiology has yielded incomplete and contradictory evidence that MFs interact with human biology. This may be due to the small number of studies undertaken examining ELF MF effects upon the human electroencephalogram (EEG), and the associated analysis of evoked related potentials (ERPs). Relatively few studies have examined how MF exposure may affect cognitive and perceptual processing in human subjects. The introduction of this review considers some of the recent studies of ELF MF exposure upon the EEG, ERPs and cognitive and perceptual tasks. We also consider some of the confounding factors within current human MF studies and suggest some new strategies for further experimentation.

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Section: Magnetic Field Effects Upon Human Electrophysiologymentioning

confidence: 64%

Human electrophysiological and cognitive effects of exposure to ELF magnetic and ELF modulated RF and microwave fields: A review of recent studies

Cook

Thomas

Prato

2002

Bioelectromagnetics

112

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“…The effects of acute exposure to ELF MF below the threshold for magnetophosphenes perception have been studied on numerous aspects of human physiology, neurophysiology, and behavior. Electroencephalogram (EEG) or evoked potentials are examples of neurophysiological parameters that have received attention among researchers (Bell et al 1992(Bell et al , 1994aCook et al 2004Cook et al , 2005aGhione et al 2005;Heusser et al 1997;Lyskov et al 1993a, b;Marino et al 2004). Although most conspicuous results seem to suggest a higher resting EEG in the alpha rhythm (8-13 Hz) after exposure in the occipital regions of the brain, the results are very heterogeneous between studies and no conclusion on the direction of these effects can be drawn.…”

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confidence: 99%

Neurophysiological and behavioral effects of a 60 Hz, 1,800 μT magnetic field in humans

et al. 2011

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The effects of time-varying magnetic fields (MF) on humans have been actively investigated for the past three decades. One important unanswered question is the potential for MF exposure to have acute effects on human biology. Different strategies have been used to tackle this question using various physiological, neurophysiological and behavioral indicators. For example, researchers investigating electroencephalography (EEG) have reported that extremely low frequency (ELF, <300 Hz) MF can increase resting occipital alpha rhythm (8-12 Hz). Interestingly, other studies have demonstrated that human motricity can be modulated by ELF MF: a reduction of anteroposterior standing balance or a decrease of physiological tremor intensity have been reported as consequences of exposure. However, the main limitation in this domain lies in the lack of results replication, possibly originating from the large variety of experimental approaches employed. Therefore, the present study aimed to investigate the effects of a 60 Hz, 1,800 μT MF exposure on neurophysiological (EEG) and neuromotor (standing balance, voluntary motor function, and physiological tremor) aspects in humans using a single experimental procedure. Though results from this study suggest a reduction of human standing balance with MF exposure, as well as an increase of physiological tremor amplitude within the frequency range associated with central nervous system contribution, no exposure effect appeared on other investigated parameters (e.g., EEG or voluntary motor control). These results suggest that 1 h of 60 Hz, 1,800 μT MF exposure may modulate human involuntary motor control without being detected in the cortical electrical activity.

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“…Exposure to static and low-frequency magnetic fields of the order of 1 G causes changes in brain electrical activity in animals and human subjects [1][2][3][4][5][6]. The anatomical location and biochemical nature of the receptor system pertinent to these changes are unknown.…”

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confidence: 99%

Resting potential of excitable neuroblastoma cells in weak magnetic fields

Sonnier

Kolomytkin

Marino

2000

CMLS, Cell. Mol. Life Sci.

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The mechanism by which static and low-frequency magnetic fields are transduced into biological signals responsible for reported effects on brain electrical activity is not yet ascertained. To test the hypothesis that fields can cause a subthreshold change in the resting membrane potential of excitable cells, we measured changes in transmembrane current under voltage clamp produced in SH-SY5Y neuroblastoma cells, using the patch-clamp method in the whole-cell configuration. In separate experiments, cells were exposed to static fields of 1, 5, and 75 G, to time-varying fields of 1 and 5 G, and to combined static and time-varying fields tuned for resonance of Na+, K+, Ca2+, or H+. To increase sensitivity, measurements were made on cells connected by gap junctions. For each cell, the effect of the field was evaluated on the basis of 100 trials consisting of a 5-s exposure immediately followed by a 5-s control period. In each experiment, the field had no discernible effect on the transmembrane current in the vicinity of zero current (- 50 mV voltage clamp). The sensitivity of the measuring system was such that we would have detected a current corresponding to a change in membrane potential as small as 38 microV. Consequently, if sensitivity of mammalian cells to magnetic fields is mediated by subthreshold changes in membrane potential, as in sensory transduction of sound, light, and other stimuli, then the ion channels responsible for the putative changes are probably present only in specialized sensory neurons or neuroepithelial cells. A change in transmembrane potential in response to magnetic fields is not a general property of excitable cells in culture.

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Influence of an alternating 3 Hz magnetic field with an induction of 0.1 millitesla on chosen parameters of the human occipital EEG

Cited by 31 publications

References 7 publications

Human electrophysiological and cognitive effects of exposure to ELF magnetic and ELF modulated RF and microwave fields: A review of recent studies

Human electrophysiological and cognitive effects of exposure to ELF magnetic and ELF modulated RF and microwave fields: A review of recent studies

Neurophysiological and behavioral effects of a 60 Hz, 1,800 μT magnetic field in humans

Resting potential of excitable neuroblastoma cells in weak magnetic fields

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